Hydraulic press for producing coated electrode rods



Dec. 11, 1956 MALAMOUD r 2,773,283

HYDRAULIC PRESS FOR PRODUCING COATED ELECTRODE RODS Filed Aug. '7. 1951 Fig.3

42 \33 30 3 INVENTORS:

G ges Ma/amau'k Max Rub/1.

ATTORN EB S HYDRAULiC PRESS FOR PRODUCING COATED ELECTRODE/RODS Georges Malamoud and Max Rubli, Zurich, Switzerland, assignors to Holding Intercito S. -A., Zurich-Oerlikon, Switzerland, a company of Panama Application August 7, 1951, Serial No. 240,740

Claims priority, application Switzerland August 9, 1950 1 Claim. (Cl. 18-13) The present invention relates to a hydraulic press for the production of coated electrode rods. In known presses of this kind in which the pressure cylinder and the mass extruding cylinder are arranged coaxially and have a common piston rod, and in which the core Wire is fed to the extruding nozzle through the common piston rod, a pre-formed mass plug is inserted into the extruding cylinder in front of the extruding piston which is then pressed out of the nozzle of the extruding cylinder together with the wire. The mass can thereby only be fed into the extruding cylinder after the piston has completed the pressing stroke and the stroke for feeding which considerably affects the output of the machine.

With such presses most troubles occur at the extruding nozzle, either due to the wire having a part of increased thickness or due to clogging by the coating mass. With the described known presses the front part of the extruding cylinder must be removed in this case, which causes a considerable delay.

It is the object of the present invention to eliminate these disadvantages. The press in accordance with the invention is characterized in that the mass extruding cylinder has a rotatable cover part arranged at the end which is remote from the pressure cylinder, whereby feeding of the mass extruding cylinder from the front side is possible, and that the rotatable cover is fitted with a wire guide opening and a mass extruding nozzle, which are disposed in an exchangeable holder.

In the accompanying drawing an embodiment of the subject of the present invention is shown. In the drawmg:

Fig. l is a partial section of the pressure cylinder and the mass extruding cylinder,

Fig. 2 is a cross-section through the forward end of the mass extruding cylinder and the parts of the rotatable cover,

Fig. 3 is a section of the articulated connection between the rotatable cover and a part of the mass extruding cylinder along the line II in Fig. 2,

Fig. 4 is a section along the line lI--II in Fig. l.

The pressure cylinder 1 and the mass extruding cylinder 2 each have a connecting flange 1b and 2b, between which a plate 3 may be arranged. The two cylinders are fastened together by means of bolts 4. A sealing ring 5 is screwed into the rear end of the pressure cylinder in which the guide tube 6 of the wires 7 is arranged. The guide tube 6 passes through the hollow piston rod 8 which carries the pressure piston 8a and the extruding piston 9. The guide tube 6 extends to the projection 10 of the mass extruding nozzle 12, Fig. 2. The tubes 13 and 14 are connected to the pressure cylinder 1 and lead the pressure fluid to each side of the pressure piston 8a. The plate 3 serves as a cover for the pressure cylinder and contains stuffing boxes not shown in the drawing for sealing the piston rod bore. The pressure fluid tube 14 leads into the plate 3. The use of the plate 3 as a cover for the pressure cylinder makes the production of the press nitedStat Pflm DG- 2,773,283 Patented Dec. 11 6 he reached from the outside and cleaned if necessary.

For introducing the mass plug the piston 9 is only withdrawn for such a distance that it still extends into the closed part of the cylinder 2. At the free end of the mass extruding cylinder a flange ring 16 is fastened by means of screws 17. The flange ring has hinge eyes 33 in which the pin 32 is rotatably arranged. Between the eyes 33 the pin 32 carries the eyes 30, Fig. 3, of the ring 29 in which the cover cap 20 is rotatably disposed and laterally held by the threaded ring 29a in order to be able to be rotated about the pin 32 for opening and closing. The pin or shaft 32 may rotate in the eyes 30. For locking the cover cap 20 in the closed position the cap and the flange ring 16 are fitted with a thread 18 and 19 respectively. The thread of both parts can be, for instance, divided, by six grooves, into six sections of approximately 30" width, so that the threaded parts of the flange ring 15 can engage the grooves 20a of the cap 20. On rotating the cap 20, the threaded parts of the two parts will engage and the cover cap will be screwed into the flange ring. As the cover cap 20 is rotatable about the pin 32, the connecting region of the two parts must be of conical or spherical shape. In the present example it is shown as spherical. The cover cap 20 carries the extruding head 12 in which the wire guide ring 21 and the screw 22 are arranged. The latter carries another ring 24 with the mass extruding nozzle 24a. The ring 24 is fastened to the screw 22 by means of the nut 25. The extruding head 12 and the ring 22 are fitted with corresponding openings 26, 27 which are arranged symmetrically to the wire axis and through which the mass is pressed to the nozzle of the ring 24.

For rotating the cover cap 20 a worm gear segment 35 is fastened to the cap by means of screws 34 which meshes with a worm 31 keyed on to a shaft 32 which also carries a hand lever 36. The latter is fitted with .a plunger 38 which is pressed into a recess of the disk 40 by the spring 39. The disk 40 is fastened to one of the eyes 33 by means of screws 42.

The operation of the press is as follows: When the extruding cylinder is closed the lever 36 is in the position which is shown in Fig. 1. When the lever 36 is rotated as indicated by the arrow the cap 20 is first rotated through about 30 about its axis by the worm 31 and the worm wheel segment 35. The threaded parts of the cap are thus brought out of engagement with the threaded parts of the flange ring 16. After the lever 36 has rotated through the angle a the worm wheel segment 35 cannot rotate further since it rests against the wall of the aperture 29a. On further moving the lever 36 the cover cap is thus rotated about the pin 32 into the open position shown with broken lines in Fig. 2. Now a mass plug can ,be inserted after the withdrawing piston 9 into the extruding cylinder 2 whereby a loss of time is avoided. The mass plug can consist of one piece and need only have a bore which is slightly larger than the diameter of the wire guide tube 6. The cover cap 20 is then rotated back against the flange ring 16 by the lever 36 and, on further rotating the lever, the cap is rotated about its axis and screwed into the flange ring 16.

We claim:

A hydraulic press for the manufacture of coated electrode rods, said press comprising, in combination, a pressure cylinder, an extruding cylinder extending coaxially with said pressure cylinder and having a rear end connected with said pressure cylinder and an open front end, a common piston rod for both cylinders, said piston rod having an axial bore formed therein for the core wire, a flange ring upon the front end of said extruding cylinder and having formed thereon sections 512 spherical and grooves between said sections, acover cap having sections of spherical threads adapted to mesh with the spherical thread sections of the flange ring and being at most as large as said grooves, whereby a rotation of said cover cap will en gage said cap with said flange ring and 'will interrupt this engagement, a pin rotatably mounted in said flange ring transversely to the direction of said cylinders, 21 ring rotatably supporting said cover cap I and said ring and-having a slot formed therein, a worm gear segment connected with said cover-cap and freely movable to a limited extent in said slot, a worm keyed upon said pin and meshing with said worm gear segment, and a hand lever swingable with said pin, whereby an initial swinging of said hand lever will turn said cover cap'- to unlock the same, whereupon said cover cap is swingable along with said lever.

References Cited in the file of this patent UNITED STATES PATENTS 537,465 Koerner Apr. 16, 1895 661,775 Silfversparre Nov. 13, 1900 1,947,202 Homeier Feb. 13, 1934 2,457,459 Gloor Dec. 28, 1948 

